Q2. How will you execute a Python script in Unix?Some of the popular libraries of Python used for Data analysis are: I. Pandas: Powerful Python Data Analysis Toolkit II. SciKit: This is a machine learning library in Python. III. Seaborn: This is a statistical data visualization library in Python. IV. SciPy: This is an open source system for science, mathematics and engineering implemented in Python.
Q3. What is the difference between append() and extend() functions of a list in Python?br>To execute a Python script in Unix, we need to have Python executor in Unix environment. In addition to that we have to add following line as the first line in a Python script file. #!/usr/local/bin/python This will tell Unix to use Python interpreter to execute the script.
Q4.What is the difference between ‘is’ and ‘==’ in Python?In Python, we get a built-in sequence called list. We can call standard functions like append() and extend() on a list. We call append() method to add an item to the end of a list. We call extend() method to add another list to the end of a list. In append() we have to add items one by one. But in extend() multiple items from another list can be added at the same time.
Q5 What is the output of following code in Python?We use ‘is’ to check an object against its identity. We use ‘==’ to check equality of two objects. E.g. >>> lst = [10,20, 20] >>> lst == lst[:] True >>> lst is lst[:] False
>>>name=’John Smith’
>>>print name[:5] + name[5:]
Output of this will be John Smith This is an example of Slicing. Since we are slicing at the same index, the first name[:5] gives the substring name upto 5th location excluding 5th location. The name[5:] gives the rest of the substring of name from the 5th location. So we get the full name as output.
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